Return NULL if the map contains no mapping for this key. A return value of NULL does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to NULL. The containsKey operation may be used to distinguish these two cases.

Parameters:

vKey

key whose associated value is to be returned.

Returns:

the value to which this map maps the specified key, or NULL if the map contains no mapping for this key.

Return NULL if the map contains no mapping for this key. A return value of NULL does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to NULL. The containsKey operation may be used to distinguish these two cases.

Parameters:

vKey

key whose associated value is to be returned.

Returns:

the value to which this map maps the specified key, or NULL if the map contains no mapping for this key.

Return the value to which the map previously associated the key, or NULL if the map contained no mapping for this key. (A NULL return can also indicate that the map previously associated NULL with the specified key.) The map will not contain a mapping for the specified key once the call returns.

Parameters:

vKey

key whose mapping is to be removed from the map.

Returns:

previous value associated with specified key, or NULL if there was no mapping for key.

The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is unspecified if the specified map is modified while the operation is in progress.

The collection is backed by the map, so changes to the map are reflected in the set. If the map is modified while an iteration over the collection is in progress, the results of the iteration are undefined.

The collection is backed by the map, so changes to one are reflected in the other. If the map is modified while an iteration over the collection is in progress, the results of the iteration are undefined.

Each element in the returned set is a Map::Entry::View. The set is backed by the map, so changes to the map are reflected in the set. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined.

Each element in the returned set is a Map::Entry::Handle. The set is backed by the map, so changes to one are reflected in the other. If the map is modified while an iteration over the set is in progress, the results of the iteration are undefined.